Выражение встречается в следующем контексте:
For example, Nissan Quest / Mercury Villager has common problem with EGR system causing the "Check Engine" light to come one. Nissan issued the bulletin that describes this problem and how to fix it. Once you read it, turns out that all needs to be replaced is small rubber hose two inches long called BPT valve bottom hose.

Очень нужно понять, что это за шланг такой.

Заранее спасибо